Hi guys Looking for some advice please. We have a 2019 118i (front drive) with 16k on the clock. All servicing is up to date. We’re getting a very slight egg like smell through the air vents when the engine is hot. It happens after we’ve slowed down or stopped, eg at lights and are then pulling off. It clears quickly and is fine when driving at normal speed. We had a transmission oil service recently and thought it may be that some old oil had spilt but that’s been checked and all is fine. We’ve